Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a2f772d4de84ff…

MALICIOUS

PDF

101.7 KB Created: 2021-07-10 06:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a590bce399246e2279f8777bab48dd43 SHA-1: d9057bff3c448c2905f78b7da85d9db2c22ac6ed SHA-256: 83a2f772d4de84ff3e8771ea0ff5cc183811da0984814ac406cc28980e55641a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e0595fc7d363a8cad2a7b898969d1ac1/bupusiwarot.pdf
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/89955652490.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5ce83bf9---28229164936.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607987ae314aa---46490184455.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7bb6004f---liwokamaginufoxiwijabel.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eefa0e84---43855095554.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4h4t901qgf08dsfc63i7flr7bu/79129351678.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5327a9d0d---letexanovuzefimuzukusexe.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b770d4e98a---56371214727.pdf
    • http://argyleliquidations.com/userfiles/files/78456166131.pdf
    • http://goldnumber.info/userfiles/file/mokesi.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/mowidosojifizijuned.pdf
    • https://abofahed.com/userfiles/file/57617750834.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/eubn3448ftp2ahk0iav868ca21/28913868174.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/55807c685c030bc4803ec2103a6f2d6e/vagusubixofasiwagetosuvu.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/450oeaqp35lnhudmulfbaf5235/besuvikebiz.pdf
    • http://hugslock.com/app/webroot/img/files/zimirilavoraputewitukaw.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ee696ecc---62262889402.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/92e3b24b896d58a7ad6c17d8715c3322/pizimugupiliguwakab.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/pebimemuwugatide.pdf
    • http://barudan.hk/UploadFile/file/20210618011246451.pdf
    • https://ivanda-commerce.hr/userfiles/file/mazax.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb00e2b299---ruvoduzavakaxonovolegedod.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tejp5lvdr5j910eb19ni4g0ni4/todesujenolisajagijur.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac043e8b644---buxolute.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=names+starting+with+sha+for+baby+girl
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 16792 bytes
font_01_sfnt_off0001428e.bin
4f610186ffaea82e366d5cbcae64461cfca05dfe9c8c7a3cdccbc9d5e7931246
pdf-font-stream PDF embedded font (sfnt) at offset 0x1428E 17720 bytes
font_02_sfnt_off00016fd5.bin
bd4c5da22a82b1433af69636f328f9c241691722489ebc27a963745796df4c72
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD5 10976 bytes